A method for extracting pectin from pomelo peel

Abstract

The invention discloses a method for extracting pectin from shaddock peel, and belongs to the technical field of shaddock deep processing. The pectin with the purity reaching up to 98.3% to 98.7% is quickly prepared by taking shaddock white rind obtained after naringin extraction as a raw material through the steps of sulphurous acid solution preparation, stabilized shaddock peel mixed solution preparation, pectin extracting solution preparation, pectin separating solution preparation, pectin concentrated solution preparation, pectin filter cake preparation, pectin preparation and the like. According to the method, the pectin is extracted through sulphurous acid, therefore, degradation of acid on pectin molecules is eliminated, and corrosion of strong acid to production equipment is reduced; centrifugal separation is conducted on pectin filtrate through a disk centrifuge, separation liquid is concentrated through an ultrafiltration membrane, therefore, the pectin quality is obviously improved, and meanwhile energy consumption is reduced; the production equipment is conventional equipment, the production condition is easy to implement, operation is convenient, the method is suitable for industrialized production, and the product quality meets the market requirements. The pectin product produced through the method can be widely applied to the fields of food, cosmetics and the like.

Description

[0001] 1. Technical field [0002] The invention belongs to the technical field of grapefruit deep processing, and in particular relates to a method for extracting pectin from grapefruit peel. [0003] 2. Background technology [0004] The annual output of pomelo, a staple fruit variety in my country, is 20 million tons. Pomelo is composed of three parts: peel, pulp and seeds, of which the pulp is the edible part. After eating the pulp, the peel, which accounts for 20% to 30% of the fruit weight, is often discarded and has not been effectively utilized; in addition, there are a large number of aging pomelo varieties in my country, which are difficult to sell or sell due to thick skin, poor pulp taste or many seeds. The price is extremely low. Therefore, the fruit grows on the tree and no one cares about it, and it is left to fend for itself, which has both seriously affected the enthusiasm of the growers and caused environmental pollution. [0005] Fresh pomelo peel contains a...

AI Technical Summary

Problems solved by technology

The main disadvantages of this method are: ①The raw material is only chopped, and the fine particles are selected without sieving, and there are large particles in the chopped material of the raw material, which causes uneven mixing and incomplete dissolution during the extraction process, reducing the extraction rate; ② Activated charcoal as decolorizer

Due to the uneven particle size of activated carbon, activated carbon is mixed in the filtrate, which is difficult to remove and affects the quality of pectin; woody activated carbon resources are scarce and expensive. Increased production cost; ③ the pectin extract is only filtered once, and the removal of impurities is not thorough, resulting in a large amount of dietary fiber remaining in the filtrate, reducing the purity and gel strength of the pectin; ④ vacuum concentration of the extract, heating Large, high energy consumption, high production cost